Distributed photovoltaic DC aggregation access topology and multilevel coordinated control strategy
In order to address the issue of reverse overload caused by large-scale distributed photovoltaic(PV)integration in the distribution network,a solution for distributed photovoltaic DC aggregation access and a multilevel coordinated control strategy are proposed,starting from the access method.Compared to conventional AC access schemes,this solution can further reduce investment costs,increase the photovoltaic access radius,and avoid power quality issues.This control strategy differs from the maximum power point tracking(MPPT)method.When distributed photovoltaics generate excess power,the grid-connected converter switches to a constant power control mode,limiting the output power of the converter.Meanwhile,the distributed photovoltaic converter adopts a voltage-power droop control strategy,maintaining the DC bus voltage within a controllable range,thus achieving adjustable and controllable distributed photovoltaic power.Simulation results show that the proposed multilevel coordinated control strategy has good transient stability control performance,ensuring stable DC bus voltage.At the same time,the droop coefficient allows flexible control of the output power of different distributed photovoltaic units,ensuring that the output power remains within a controllable range.This provides a theoretical reference for the grid integration of distributed photovoltaic systems in rural areas.
distributed photovoltaic(PV)multilevel coordinationdroop controlmaximum power point tracking(MPPT)new energy consumption
万方数据
维普
